Polishing machine



D. I?.y McGOVERN. 'POLISHING MACHINE. APPLICATION FILED APR.10, 1920.

Patented Apr. 4, 1922.

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n APPLICATION FILED APR. Io, I9 2o. 1,411,923.

3 SHEE YS-SHEET 2.

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n. F. MC'GOVERN.

POLISHING MACHINE.

APPLICATION FILED APR, 10, i920.

3 SHEETS-SHEET 3- PIGIV liz/1612201* Patented Apr. 4, 1922.

UNITED STATES PATENT OFFRC.

DANIEL FREDERICK MGGOVERN, OF MONTPELIER, VERMONT.

POLISHING- MACHINE.

Application filed April 10,

To all whomy t may concern.'

Be it known that 1, DANIEL F. MoGovnnN, a citizen of the United Sta-tes,residing at Montpelier, county of Washington, State of Vermont, haveinvented certain new and useful Improvements in Polishing Machines, ofwhich the following is a speciication.

This invention relates to polishing machines and particularly to machineof the swinging arm type. ln machines of Athis sort it is of greatpractical advantage to have the arm capable of a complete swing aboutits support. A capacity for such movement greatly enlarges the output ofthe machine as it is available for work on all sides of its mounting. 1nheavier machines it is important that the mounting be fixed and of apermanent nature, and work for a machine so installed must therefore bepresented to the machine or within its working range.

ln my present invention l have provided a machine of great stability andendurance and one having a wide working area as well as an easyoperation and adjustment through that area. The form of my machineherein shown is a practical embodiment found en tirely satisfactory inyard or shed. Throughout the specification and the drawings showing thisillustrative embodiment like reference characters are employed toindicate corresponding parts, and in the drawings:

Fig. 1 is a side elevation of the machine.

Fig. 11 a detail of the head.

Fig. 111 a sectionthrough they center arm shaft.

Fig. 1V a detail of the arm bearing on the column, and

Fig. V a vertical sectional view through the spindle. A

My machine comprises a base .1. bearing a vertical column 2 havinga head3 rotatably mounted on the top of the column. The arm comprises acylindrical bearing fl which surrounds the column 2 from which is eX-tendeda pair of frame or ladder arms 5--5 braced by a web 51. The endsof the arms 5-5 have bearings. 6 in which swing the bearing ends of anarm extension 7. At the other end of the arm extension 7 are bearings 8in which is the vertical work spindle 9.

Within the vertical column 2 which is fixedA on the base 1 is a shaft'10 driven by suitable Specification of Letters Patent.

Patented Apr. 4, 1922.

1920. Serial N0. 372,896.

gearing from a power shaft 1l. On the upper end of the shaft 1() is apinion 12 which through an idler 13 and a meshing pinion 1d drives Vthcshaft 15. The shaft .15 has abearing 16 in the head 2l and also hasbearings at 1T and 1S in the column bearing el. Between the l'iearings17 and 18 1s mounted a pulley 1S) splinedvto the shaft 15 so that thearm 5 together with the pulley may be vertically raised and lowered onthecolumn 2. The shaft 15 of the pulley 19- is disposed opposite to thearm 5 and extension 7. .On the oppositek side of the Shaft 15 is a fixedguide rod- 20 carried by the head 3 and extending down through the arms5 so as to balance, guide and steady the arm and head 3 in all positionsof ver-` tical adjustment and swing.

1t is vto be noted that the interposition of the idler 13 has theeii'ect of offsetting any creeping tendency of the arms 5 about thecolumn 2. lVhile the location of the pulley on the opposite side of thecolumn 2 from the arm might be shifted to the other side, it isadvantageous in the balance of the machine. The idler however balancesany creeping' tendency and leaves the arm uninluenced byplanetary[movement which otherwise would. be present.

On the same side of the bearing l is a multiple pulley 21 and on thehead- 3 directly above it is a corresponding pulley 22. The chain orcable indicated Yat 23 is passed about 1these pulleys and preferablymade fast at one end tothe head The other end is brought around a pulley24e and carried to a drum 25 mounted on the arm 5. The shaft 251 issuitably connected to a shaft 26 iitted with a hand wheel 261 and havingat its other end a bevel friction wheel 262 which may be brought inContact with either the friction wheel 27 or 28 of the shaft 30. Thesefriction wheels are shiftable by a bell crank 31 connected by link 32with a bent lever The end of the lever 331 is brought down to aconvenient )osition in relation. to certain other levers ereinafter tobe described so as to make the control of the machine within theimmediate hand grasp of the operator.

The shaft 30 as more clearly appears in Fig. 111 is suitably bushed andjournaled within the sleeves 301 within the bearings 6 of the arms 5.The arms 7 have bearings 71 throu h which the sleeves 61 are passed andfixecgl by suitable set screws. Between the arms 7 are a pair of pulleys34 and 35. The pulley 34 is belted to the pulley 19, the pulleys beingof such diameter that the belt passes freely around the web 51 and thecolumn 2. The pulley 35 is connected by a second belt to the pulley 36on the work spindle 9. The pulley 36 is loose on the spindle 9 butcarries a clutch 37 adapted to be engaged by a corresponding clutchmember 38 splined indirectly to the spindle 9. The clutch member 38 iskeyed on a hollow sleeve 60 held between the main bearings 61 of theshaft 9. Through this sleeve 60 the spindle 9 passes, and to it thespindle 9 is keyed. This splining to the spindle 9 permits the verticalmovement ofthe spindle as far as the limiting stops 39 permit. Themovement of bringing the tool carried by the work spindle intoengagement with the work is effected by a hand lever 40 having a handgrasp 401 and pivoted at its opposite end 402 to a bracket 41 on thelower' side 'of the arm. The clutch member-'38 is moved by a lever 42pivoted at 43 in a bracket 44 and connected by a link indicated indotted lines at 45 to the inner end of a lever 46 pivoted as indicatedin broken lines at 47. lhe inner end of'this lever 46 indicated at 461lies just above the hand grasp 401 of the spindle lever 40.

` The pivoting of the arms, the disposition of the pulleys and thebeltingV permits the work spindle tok be carriedaround through a comlete circle or surroundin zone lying entire y about the column 2. 1ehead 3 is lso balanced and mounted on the column 2 that the arm 5, 7 ismoved with very little effort. The head 3 runs on ball bearings 31interposed between its lower face and an annular bracket 21 carried onthe column 2. The head 3 has the bearing 101 ofthe shaft 10 disposedcentrally of itand the bearing 16 of the shaft 15 and the rod 20 aresymmetrically disposed on opposite sidesso {lhal they also balance,guide vand steady the The bearings 4 of the arms 5 enclosing the column2 are provided withl an annular pocket or recess as at 50 and in thisannular pocket are located an annular antifriction set. This setconsists of a hardened sleeve 51 enclosing the column 2 and acorresponding larger annular sleeveV 52 set against the back Wall of thepocket 50. Be tweenthese sleeves 51 and 52 is a roller bearingconsisting of a plurality of rollers 53 carried in a suitable cage 54.The arm 5 has therefore a great freedom and ease of rotation about thecolumn 2. Furthermore on account of the position of the pulley 19 thedriving strain is very evenly balanced and taken up against the column 2which lies between it and its driven pulley 34.

The roller bearing in the pocket 52 is closed by a cap 55 and scaled bya packing 56 which prevent-s the entry of anv dust or grit within thisbearing as the arm is vertically adjusted. Although the arms 5, 7 may beraised by the hand wheel 26, vertical adjustment of the arm as well asits control, otherwise 1s effected through the lever group 33, 46 and40. As will be seen in F ig. I, the ends of these levers 331, 461 and401 are disposed in a convenient juxtaposition so as to be within theimmediate grasp and control ofthe operator at the work spindle end ofthe arm. This permits a positive and immediate control of the arm inanyposition of the arm through the entire 360O of swing and in anyradial position in thezone about the column 2.

' Various modifications in the construction and operation of my devicemay obviously be resorted to if Within the limits of the appendedclaims.

What I therefore claim and desire to secure by Letters Patent is:

j 1. In a polishing machine, a fixed hollow column, a revoluble headthereon, a central vertical drive shaft therein and eX- tending throughsaid head, an 'arm having a bearing embracing said column, a pulley onsaid bearing on the opposite side of said arm,"a shaft for said pulleyand splined thereto, said shaft being journalled in said head and gearedto'said drive shaft. 2. In a polishing machine, a fixed hollow column. arevoluble head thereon, a cen tral vertical drive shaft therein andextendingV through `said head,an arm having a bearing embracing saidcolumn, a pulley on said bearing on the opposite sidc of said arm, ashaft for Said pulley and splined thereto, said shaft being journalledinsaid head and geared to said drive shaft, an eX- tension arm pivotedtothe end of said first-` named arm, a shaft in the axis of said armpivot, a pair of pulleys on said shaft, a work shaft at the end of theextension'arm, and a drive for said work shaft. i

3. In a polishing machine, a fixed hollow column, a revoluble headthereon, a central vertical drive shaft therein and extending throughsaid head, an arm having a bearing embracing said column, a pulley onsaid bearing on the opposite side of saidarm. a shaft for said pulleyand splined thereto, said shaft being journalled in said head and gearedto said drive shaft, an extension arm pivoted to the end of said firstnamed arm, a work shaft at the end of the extension arm, and a drivepulley for said work shaft.

4. In a polishing machine, a fixed hollow column.a revoluble headthereon, a central vertical drive shaft 'therein and extending throughsaid column and head, an arm having a bearing embracing said column, apulley arm, a shaft geared to said drive shaft and mounted on said headand passing through said arm, and a pulley on said bearing and splinedthereto.

In a polishing machine, a fixed hollow column, a revoluble head thereon,a drive shatt extending through said column and head, an arm having abearing embracing said column, a pulley on said arm, a shaft for saidpulley and splined thereto, said shaft being journalled in said iheadand geared to said drive shaft, an extension arm pivoted to the end ofsaid lirst named arm, a shaft in the axis oit' said arm pivot, and apair of pulleys on said last named shaft.

o. In a polishing machine, a fixed hollow column, a revoluble headthereon, a drive shaft't extending through said column and head an armhaving a bearing eniibracing said column, a pulley on said arm, a shaftJfor said pulley and splined thereto, said shaft being journalled insaid head and: geared to said drive sha-ft, an extension arm pivoted tothe end oi said first named arm, a shaft in the axis of said arm pivot,a pair ot' pulleys on said shaft, a work shalt at the end ol' theextension arm and a drive pulley for said work sliatt.

7. In a polishing machine, a tixed column and a head rotatably mountedon t-he top thereof, an arm rotatably and slidably mounted on saidcolumn, and a pair ot shafts disposed one on each side oft' said headand slidably engaging said arm,

S. In a polishing machine, a ixed column,

and a head rotatably mounted on the top.

thereofA` an arm rotatably and slidably mounted on said column, and apair oit shafts disposed one on each side oi said head and geared toearh other and slidahly engaging said arm. l

S). In a polishing machine, a lixed column, a revoluble head thereon, acentral drive .shaft passingl through said head and haring a pinionthereon, a second vertical shaft carried by said head outside of saidcolumn,

and having a pinion at its upper end, and an intermediate pinion on saidhead and engaging said two tirst named pinions.

l0. In a polishing machine, a fixed hollow column. a revoluble headthereon, a central vertical drive shaft therein and extending throughsaid column, an arm having a bearing embracing said column, a pulley onsaid arm, a shaft mounted on said head passing through said arm, apulley on said bearing and splined thereto, a pinion on the ver` ticaldrive shaft, a pinion on said pulley shaft, and a pinion on said headintermediate oi said pinions.

ll. In a polishing machine, a fixed hollow coulmn, a revoluble headthereon, a central vertical drive shaft therein and extending throughsaid column, an arm having a bearing emb acing said column, a pulley onsaid arm, a shaft mounted on said head passing through said arm, apulley on raid bearing and splined' thereto, a pinion on the verticaldrive shaft, a pinion on said pulley shaft, and a pinion on said headintermediate of said pinions, an extension arm pivoted at. the end ofthe tiret-named arm, a sha-tt in the axis of said arm pivot, a pair oli'pulleys on said sha-tt, a Work shaft at the end ol said extension arm,and a drive pulley on said'A shaft.

l2. In a polishing machine, a Vfixed column, a central vertical driveshaft thereinl and eX- tended through said column, an arm having abearing embracing said column, a pulley on said. bearing, a shaftpassing through said bearing, a pulleyY on said bearing and splined tosaid shaft, a. pinion on the vertical drive shatt, a pinion on saidpulley shaft, and an idle pinion intermediate of said pinions.

In testimony whereof I affix my signature in presence or" two witnesses.

DANIEL FREDERICK McGOVERN.

.lVitnesses l). P. ldrriiN, R. B. PIERCE.

